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10% solution [Jun. 29th, 2011|09:29 pm]
Chemistry Help



I need to make  10% formic acid   (my formic acid has a 88% purity)

i'm confused as to how to do this. let's use 100 mL to make it easier to calculate.

Do I:

A.  10 mL formic acid + 90 mL H20


B. 10 mL formic + 100 mL H2O?

When do I use A and when do I use B to calculate?

I was making a 0.1% Formic acid in water 1 L solution, I used calculation B to make the solution.  1.14 mL of formic acid + 1000mL H2O.

[User Picture]From: grenjelybean
2011-06-30 08:01 pm (UTC)
Volume percent is defined as volume of solute over volume of solvent. so 4.25mL/100mL is 4.25%. But then it's not really because it's not 100% pure H3PO4. So, I don't know.

Concentration can be quite tricky sometimes if you miss exactly how it's being expressed.
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